linux-kernel - Re: [RFC 3/5] dt-bindings: power: Add binding for MediaTek MT7988 topmisc power controller

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Message-ID: <2EA2BDB0-E1C9-49BC-98FC-5048905AA036@public-files.de>
Date: Tue, 15 Apr 2025 11:52:19 +0200
From: Frank Wunderlich <frank-w@...lic-files.de>
To: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>,
 Frank Wunderlich <linux@...web.de>, Chunfeng Yun <chunfeng.yun@...iatek.com>,
 Vinod Koul <vkoul@...nel.org>, Kishon Vijay Abraham I <kishon@...nel.org>,
 Rob Herring <robh@...nel.org>, Krzysztof Kozlowski <krzk+dt@...nel.org>,
 Conor Dooley <conor+dt@...nel.org>,
 Matthias Brugger <matthias.bgg@...il.com>
CC: Daniel Golle <daniel@...rotopia.org>, Sam Shih <sam.shih@...iatek.com>,
 MandyJH Liu <mandyjh.liu@...iatek.com>, linux-arm-kernel@...ts.infradead.org,
 linux-mediatek@...ts.infradead.org, linux-phy@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [RFC 3/5] dt-bindings: power: Add binding for MediaTek MT7988 topmisc power controller

Hi Angelo,

Am 14. April 2025 12:25:23 MESZ schrieb AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>:
>Il 13/04/25 10:58, Frank Wunderlich ha scritto:
>> From: Frank Wunderlich <frank-w@...lic-files.de>
>> 
>> Topmisc is a systemcontroller used for xs-phy and ethernet on  mt7988.
>> Add binding for it.
>
>That's the wrong binding... check mfd/syscon.yaml :-)
>
>P.S.: Is there any reset controller in topmisc? Any clock?
>      If yes, syscon.yaml is also wrong, and you need a driver for that.
>      Remember: If it turns out *later* that this has clk/resets and the
>      bindings are already set for just a syscon, it's gonna be way harder!
>
>Cheers,
>Angelo

Ok based on the power-domain-cells property i guessed powercontroller is the right place.

But based on your suggestion i tried moving compatible to syscon binding and made dtbs_check here.

I can confirm dropping the unexpected properties reported by syscon binding (power-domain-cells,clock-cells,adress-cells and size-cells) are not needed for function (xsphy and ethernet).

For verifying that there are really no clocks/resets in topmisc (have not found it in public available register documents) i asked mtk (waiting for answer).

Also got it working without the syscon compatible by changing ethernet driver too (after this change xsphy was also working).

Eth:
https://github.com/frank-w/BPI-Router-Linux/commit/d866e648717800b6f6395ad36c38f9effcf0498d
Xsphy:
<https://github.com/frank-w/BPI-Router-Linux/commit/0121a94df99700487704ca056b210b13db07e90c>

regards Frank